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Granular power is a well-known approach to achieve fast dynamic voltage and frequency scaling (DVFS) for SoCs. For effective granular power the voltage regulators (VRs) must be very small and very fast. Conventional MOSFET-based VRs cannot achieve these goals without significant compromise in efficiency and/or current capability. Fortunately, compound semiconductors can help alleviate this issue....
A new GaAs power switching device, the gFET™ switch was introduced at APEC 2013. This paper describes devices developed since APEC 2013 including depletion mode devices with nominal on resistances of 7, 14 and 40 MΩ as well as an enhancement mode device with a nominal on resistance of 40 MΩ. The enhancement mode device is particularly well suited for use as a control switch in buck converters. The...
The history of power electronics has been characterized by progress mainly based on improved switching devices. SCRs opened the door to modern power electronics. The silicon MOSFET made possible incredible density and efficiency. However, the silicon MOSFET is running out of steam. SiC and GaN are very promising for higher voltages [1] but are poorly suited for low-voltage switches that are so widely...
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